Doubt they'll be still good. Lithium batteries start to degrade the minute you've manufactured them. If they're not in proper storage conditions (temperature and charge level) as well then the degradation is going to happen even faster.
They've gone through 5 hot summers in a non-AC veranda which turns into a greenhouse, and 5 quite cold winters where it definitely must have gone below 0°C.
I guess I can dispose them. Am I correct in assuming that they should not explode/fire up if broken or short-circuited, when without charge?
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